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As the comments indicate this is slow release fertilizer mixed in with the soil less mix at the plant. The biodegradable resin coated shell allows for a slow release of the fertilizer. A common trade name is Osmocote. More details are here It was first made by Archer Daniels in the 1960's but has gone through a few owners since then. Details here. The ...


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IMO the only place 93% sulphuric acid belongs is in a chemistry lab or an industrial plant. It is a very hazardous material. Using sulphuric acid directly at any concentration is probably a bad idea, because it will react with organic materials (e.g. cellulose and carbohydrates) in the compost, and won't do anything good to the microorganisms in the soil ...


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